HOSTS, "Helping One Student To Succeed," is a nationally-validated Chapter I program adopted by 24 schools in the Portland School District. It was designed to help low performers learn to read by providing individualized instruction on a one-to-one basis through the use of trained volunteer tutors. The HOSTS curriculum is designed as a reading program that consists of six major skill areas: reading readiness, phonetic analysis, structural analysis, vocabulary development, comprehension, and study skills. This evaluation, conducted to investigate the effects of the program, compared the achievement gains of Chapter I students who were in the HOSTS program with three different populations: (1) Non-HOSTS, i.e., students in the same grades and schools who received other Chapter I reading instruction; (2) District Chapter I students; and (3) all District students. The achievement growth of all HOSTS students in 1982-83 was compared with their achievement growth in 1981-82. Student achievement was measured by the results of the Comprehensive Test of Basic Skills and the Portland Achievement Levels Tests. Based on research findings, it was concluded that HOSTS produced positive, non-significant gains, results which are better than the average of other Chapter I supplementary programs, but are not significantly better. (PN)